or a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 22 students, and the distribution of total study hours per week is bell-shaped with a mean of 13 hours and a standard deviation of 2.7 hours. Use the Empirical Rule to answer the following questions. a) 68% of the students spend between 8.6 Incorrect hours and 15.4 Incorrect hours on Statistics each week. b) 95% of the students spend between 5.2 Incorrect hours and 18.8 Incorrect hours on Statistics each week. c) 99.7% of the students spend between 1.8 Incorrect hours and 22.2 Incorrect hours on Statistics each week. Question HelpQuestion 16: Message Message instructor